Two former Parramatta Eels players are accused of harbouring semi-automatic weapons and possessing more than half-a-million dollars in cash after dramatic arrests in Sydney's Centennial Park yesterday.

Come clean on water scandal, PM: Shorten

Prime Minister Tony Abbott must say what he knew about the Australian Water scandal that sunk Barry O'Farrell, Opposition Leader Bill Shorten says.

In his first public appearance since the death of his mother, Mr Shorten told reporters Australians needed to know their prime minister had no links to the scandal.

Evidence given by Barry O'Farrell about a $3000 bottle of wine from Australian Water Holding's Nick Di Girolamo led to his resignation as NSW premier last week.

Mr O'Farrell had told NSW's Independent Commission Against Corruption (ICAC) under oath that he had not received the vintage bottle of Grange Hermitage.

Mr O'Farrell's handwritten note of thanks to Mr Di Girolamo for the wine - a gift marking his 2011 election win - was presented to the ICAC.

Mr Shorten said "shocking revelations" at the corruption watchdog needed to be cleared up.

"We see a toxic political culture and it is important that our prime minister spells out what he knew and when he knew of these matters so that he can clear the air," Mr Shorten told reporters on Monday.